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- W809697851 abstract "Response of three ornamental perennials to drought stress. Perennials are an important part of the urban public space and private gardens. However, they are not always properly watered and may suffer from drought stress. In this trial, three commonly used species: heartleaf saxifrage Bergenia cordifolia, avens Geum coccineum and stonecrop Sedum spectabile were tested for their response to water stress. These species originate from different habitats and developed different adaptation mechanisms to drought. In the test, the drought stress was imposed over the period of fi ve months by withholding watering during 10 days cycles, separated by 10 days of normal daily watering. At the end of each month, leaf concentrations of chlorophyll a+b and ammonium were determined and at the end of the experiment the infl orescence height in all plants was measured. Water defi cit decreased the ornamental value, evaluated as the infl orescence height in heartleaf saxifrage and avens, and did not affect stonecrop. Under stress, the mean ammonium concentration increased signifi cantly in the leaves of heartleaf saxifrage and avens, reaching the values six times those in normally irrigated controls. Changes in the chlorophyll a+b contents were less pronounced: mean leaf pigment concentrations were practically unaffected by drought in stonecrop and decreased by 24–29% in the other two. The results show that changes in the ammonium and chlorophyll a+b contents merit further attention as possible indicators of plant response to drought. However, additional studies are needed before these or other parameters can be used to evaluate new species of perennials for introduction into urban growing conditions, or as selection criteria in breeding for the adaptation to demanding growth" @default.
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- W809697851 date "2010-01-01" @default.
- W809697851 modified "2023-09-23" @default.
- W809697851 title "Response of three ornamental perennials to drought stress" @default.
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